Had a scare this week. I added a new fish to my aquarium. He looked like he was doing fine, eating well, and everything. With the 100 gallon now, I figured I should increase my fish population from the 4 small fish that I've had for the past few years, and the McCosker's wrasse was a fish that I always wanted. Unfortunately, the wrasse broke out with ich a few days ago. I tried to catch it to treat it, but it was no use. I came to terms with the fact that the McCosker's would most likely die, but what terrified me was that I noticed a few spots of ich on my other fish. The McCosker's ended up dying, and, luckily, the ich on my other fish has completely cleared up. I've read posts with people insisting on quarantining new fish, and I've never taken it to heart. After fearing losing all of my fish this past week, I think from now on I will QT new additions. It's just not worth losing everything...